They also had announced BKK-FRA and then never operated the route. They had a B767-200ER for some time, did operate some but very few charter flights and then the aircraft was apparently repossessed by the lessor. Now the next try again with a strange name.

Now we have U Airlines and R Airline in Thailand, just missing S Airways and T Air .

No, that was just my mind wandering. I thought if they don't use the main airport in Bangkok (DMK instead of BKK) they might as well not use the main airport in Frankfurt (HHN instead of FRA). However, the announcement was for DMK-FRA.

It seems they'd have to rely on cooperating with some German tour operator and operate it as sort of a charter flight. For those customers, it probably wouldn't matter much if it was FRA or HHN. Since they don't have any feeder flights in Germany, the parking options at HHN might actually be a bonus to those not arriving by train.